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Equity Compensation Plans - Stock-Based Compensation Expense (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Stock-based compensation expense | $ 25,237 | $ 19,919 | $ 19,358
Total compensation cost related to unvested awards not yet recognized | $ 26,800 |  |
Stock based compensation expense period | 2 years 3 months 18 days |  |
Deferred income tax benefit related to stock-based compensation expense | $ 5,800 | 4,300 | 4,400
Income tax benefit realized for the tax deductions from stock-based compensation | $ 4,000 | $ 3,900 | $ 5,300

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